;;强制TAB键使用空格

 (setq-default indent-tabs-mode nil)

 ;M-i执行tab-to-tab-stop

 (setq tab-width

 c-basic-offset )

 ;鼠标滚轮，默认的滚动太快，这里改为3行

 (defun up-slightly () (interactive) (scroll-up ))

 (defun down-slightly () (interactive) (scroll-down ))

 (global-set-key [mouse-] 'down-slightly)

 (global-set-key [mouse-] 'up-slightly)

 ;重新绑定C-z到撤销

 (global-set-key (kbd "C-z") 'undo)

 ;mac下设置command为alt

 (if (eq system-type 'darwin)

     (setq mac-option-key-is-meta nil

         mac-command-key-is-meta t

         mac-command-modifier 'meta

         mac-option-modifier 'none)

 )